My ex-wife and I met at university and she rode me one Saturday evening to take her virginity when we were 20. She was outwardly resistant to experimenting but once started she enjoyed it and we experimented with positions, places, dressing, where I came, even looking at porn mags as we fucked. I once came 6 times in one afternoon as I feasted on her wearing slutty nylon underwear, once in her mouth as she experimented herself. We married when we were 23 (too young) and I curiously one evening we watched a TV documentary by Alan Wicker when he visited a Californian swinging club. Being mainstream TV it was hardly hard core (I thought nothing of it) but I was awoken in the night by her wanking me and when I turned over her legs instantly parted and she came as soon as I entered, obviously turned on by what she had seen. In our 40s one of her divorced friends was attentive to the verge of being too intrusive. One of my friends made a comment when she went with her for 24hrs to her friends house in France on some pretext - why? My (female) cousin Sue, lived locally, who always complimented Fi to me, and Ive no idea why but she told me she 'liked women too'. I acknowledged it but did not see it as an earth-shattering event as I took the view that people have lots of fantasies, but living them out was quite different. We went on holiday and spent some time on a boat with my cousins' family, when we came into port the children and me and our host were busy tidying up on deck. I had not noticed that Fi and Sue appeared on deck having showered below. I knew from Fi's face that if she had not cum she has been stimulated - a little like the TV programme. She wanted sex that night. Some months later Sue came around to our house alone and the family were away. She wanted a tour of the house. As I entered our large bedroom she commented on the dressing area and I opened one of the doors which happened to be one of Fi's wardrobes containing her lingerie drawers. I was curious to find out if indeed they has had sex on the boat and opened one of Fi's lingerie draws to show her how nice the wardrobes were (they cost a fortune) and as I did I asked Sue outright if she found Fi attractive. She confirmed she did as she could see into the draw containing Fi's lingerie (she did not know it but there was a vibrator at the back of the drawer too). We wandered around the house and once back downstairs I asked her if she would like do so something about it? My fantasy has been to have sex with Fi and another woman. Fi knew this and whilst she did not want another man, wanted to see my ass going up/down between another woman's open thighs as she masturbated herself. We had talked about it many times during sex ad Fi would progressively describe the scene in more detail, but it needed some impetus. I asked Sue if we should create the scenario? We go out for dinner as a threesome, we ensure Fi was relaxed (not drunk) on wine, we end up sitting on the sofa together in the TV room, and I switch to one of the porn channels to create the moment and Sue eagerly agreed. To develop it, I french kissed Fi and then inviting Sue to do the same, and we agreed to escalate and if Fi is unwilling its all one big laugh and we stop without incident. After a few weeks we did precisely this finding ourselves on the sofa with Fi between us... I switched to one of the porn channels, Sue nervously laughed encouraging Fi to indulge in the laugh (she did obviously having no idea) and once the initial laugh was over we settled back for a minute as I gave Fi a larger kiss than she was expecting, and on queue as I finished Sue demanded the same planting her lips on Fi before she could answer. Thankfully Fi opened her mouth as Sue forced her tongue inside Fi's mouth and I knew she was receptive. I completed the moment by fondling Fi's right breast she she kissed Sue and crucially she did not resist. We snuggled back and watched some of the porn for a moment and once Fi was clearly relaxed, I got up and left to see if it developed between them... On my return they were still sat close together but were french kissing and Fi was fondling Sue's breasts and I could see Fi's blouse had been unbuttoned. It was late, so I suggested they went upstairs to our bedroom (we had no kids at home that weekend) with the intention of following them once it developed. It was very erotic indeed to see them stand up and hold hands as they climbed the stairs. Hearing the sounds upstairs as they climbed onto the bed. I sat downstairs and listened... to some faint talking and murmuring but certainly not the porn-style moaning and groaning. I gave it about 15mins and then slipped into the bathroom to undress and put on my dressing gown. could see inside the bedroom Sue's clothes were on the bedroom floor... as I entered I saw Fi lying between Sue's open legs rubbing their vulva's together clearly close to orgasm and french kissing. I entered I quietly sat on the chair on the other side of the room before joining them on the bed, but not interfering in the moment. They did not cum in that moment and Fi turned around and french kissed me - inviting me to do the same with Sue which we did. Fi then took herself over the edge and came quietly, but shuddering as she orgasmed. They held for a moment and Sue stroked my cock who had not cum. Fi invited me to enter her (she was on her back with her legs wide apart) Sue smiled and invited me to do so. As my cousin it was an unusual moment but she was welcoming and it was very erotic to have Fi guide my bare cock into her. Sue was very wet but gripped me well and with some control from her we came together and I flooded her with sperm a....as I withdrew Fi slipped her finger inside Sue to feel my sperm, and kissed Sue. We slept all together than night and I fucked Fi with Sue masturbating alongside us but otherwise we woke up on Sunday and slipped back into normal life without any hint of an enduring threesome and with respective children and families it was easier that way. An experience had been had but oddly sex became less frequent with Fi but when it happened it was good. A couple of years later, our marriage deteriorated for other reasons, that we not clear, but the moment of separation came when I attempted to initiate sex and she refused moving immediately to the spare room claiming she no longer loved me. The friend she had visited France with reappeared after we separated, but that friendship ended quickly to be replaced with another woman 'friend' who travels with her even including a picture of FI and her as her Facebook picture! I can only guess as there is no man visibly on the horizon...I suspect Fi was one of those women we read about that gets married, has a family, reaches middle age to divorce her husband and discover she is at least bisexual...maybe she was all along. Who knows...